Buggy code:
public class AntClassLoader extends ClassLoader implements BuildListener { private class ResourceEnumeration implements Enumeration { private String resourceName ; private int pathElementsIndex ; private URL nextResource ; ResourceEnumeration ( String name ) { } public boolean hasMoreElements ( ) { } public Object nextElement ( ) { } private void findNextResource ( ) { } } private static final int BUFFER_SIZE = 1024 ; Vector pathComponents = new Vector ( ) ; private Project project ; private boolean parentFirst = true ; private Vector systemPackages = new Vector ( ) ; private Vector loaderPackages = new Vector ( ) ; private boolean ignoreBase = false ; private ClassLoader parent = null ; private ClassLoader savedContextLoader = null ; private boolean isContextLoaderSaved = false ; private static Method getProtectionDomain = null ; private static Method defineClassProtectionDomain = null ; private static Method getContextClassLoader = null ; private static Method setContextClassLoader = null ; public AntClassLoader ( Project project , Path classpath ) { } public AntClassLoader ( ClassLoader parent , Project project , Path classpath , boolean parentFirst ) { } public AntClassLoader ( ClassLoader parent , boolean parentFirst ) { } protected void log ( String message , int priority ) { } public void setThreadContextLoader ( ) { } public void resetThreadContextLoader ( ) { } public void addPathElement ( String pathElement ) throws BuildException { } public void setIsolated ( boolean isolated ) { } public static void initializeClass ( Class theClass ) { } public void addSystemPackageRoot ( String packageRoot ) { } public void addLoaderPackageRoot ( String packageRoot ) { } public Class forceLoadClass ( String classname ) throws ClassNotFoundException { } public Class forceLoadSystemClass ( String classname ) throws ClassNotFoundException { } public InputStream getResourceAsStream ( String name ) { } private InputStream loadResource ( String name ) { } private InputStream loadBaseResource ( String name ) { } private InputStream getResourceStream ( File file , String resourceName ) { } private boolean isParentFirst ( String resourceName ) { } public URL getResource ( String name ) { } protected Enumeration findResources ( String name ) throws IOException { } private URL getResourceURL ( File file , String resourceName ) { } protected Class loadClass ( String classname , boolean resolve ) throws ClassNotFoundException { } private String getClassFilename ( String classname ) { } private Class getClassFromStream ( InputStream stream , String classname ) throws IOException { } public Class findClass ( String name ) throws ClassNotFoundException { } private Class findClassInComponents ( String name ) throws ClassNotFoundException { InputStream stream = null ; String classFilename = getClassFilename ( name ) ; try { for ( Enumeration e = pathComponents . elements ( ) ; e . hasMoreElements ( ) ; ) { File pathComponent = ( ( File ) ( e . nextElement ( ) ) ) ; try { stream = getResourceStream ( pathComponent , classFilename ) ; if ( stream != null ) { return getClassFromStream ( stream , name ) ; } } catch ( IOException ioe ) { log ( ( "Exception<seq2seq4repair_space>reading<seq2seq4repair_space>component<seq2seq4repair_space>" + pathComponent ) , MSG_VERBOSE ) ; } } <START_BUG> throw new ClassNotFoundException ( ) ; <END_BUG> } finally { try { if ( stream != null ) { stream . close ( ) ; } } catch ( IOException e ) { } } } private Class findBaseClass ( String name ) throws ClassNotFoundException { } public void buildStarted ( BuildEvent event ) { } public void buildFinished ( BuildEvent event ) { } public void targetStarted ( BuildEvent event ) { } public void targetFinished ( BuildEvent event ) { } public void taskStarted ( BuildEvent event ) { } public void taskFinished ( BuildEvent event ) { } public void messageLogged ( BuildEvent event ) { } }

Fix:
throw new ClassNotFoundException ( name ) ;